Add official SK zone data

[jeanpaulrsoucy]

https://geohub.saskatchewan.ca/datasets/saskatchewan-covid-19-zones

[jeanpaulrsoucy]

Have to add the zipped geodatabase version, as this one is the only one that seems consistently updated:

https://opendata.arcgis.com/api/v3/datasets/66a139a37da04706b0adae939a25005b_0/downloads/data?format=fgdb&spatialRefId=3857